Telegraph-repeater.



R. T. DAVENPGRT.

TELEGRAPH REPEATER. v

APPLICATION FILED NOV. 7, 1913.

1,11 1,566, Patented Sept. 22, 1914.

2 SHEETS-SHEET l.

WITNE88E8 INVENTOR Q in; 1% Zflave/z or Z.- 2 I 455 i S ATTORNEYS "HE NORRIS PETERS CO.. PHOTO-LITHQ. WASHINGTON. D. C.

R. T. DAVENPORT.

TELEGRAPH REPEATER. APPLICATION 'PILED NOV. '1, 1913.

1 1 1 1 566. v Patented Sept. 22, 1914.

2 SHEETBSHEET 2.

Y I j a a q WITNESSES INVENTOR 4 flarz/fi'nTjave/z wrf ATTORNEYS THE Nokms PETERS CO, PHOTO-LITHO. WASHINGTON. D. C.

UNITED T TE PA N Q Q :RAN NE 'rEMPLE IDAVENPORTPOF WILLIAMS, ARIZONA.

' H To all whom it may concern B a known that I, RANKIN T. Diwa- Bonn, a citizen of the United States, and a' resident ofWilliams, in the county of Coc onino and State of Arizona, have invented a new and Improved Telegraph-Repeater,

of which the following is a full, clear,

exact description,

This inventionrelates to a single line telegraphjrepeater, andit has for-fits general objects to increase the speed of transmission of telegraph signals repeated from one line to another; toimprove and simplify the con structionof the' apparatus so. as tobe; reliable and efiicient in use, and to eliminate objectionable features in existing repeaters.

Single linev repeaters heretofore proposed, make use of transmitters o'r double contact relays in combination withholding coils or shunt devices which materially lessen the speed of signaling. It is well known in the operation of repeaters of this kind that'there must be a short-time interval between the opening of the line relay and the opening of the opposite line at the transmitter contact So as-to allow the shunt or holding coil to'operate before the opposite line is opened.

This materially-shortens the signals and reduces the speed ottransmission, and the I 30 inertia of the transmitter lever also contributes to this result. These objections are overcome by a novel arrangement of circuits, relays SandcOntact devices whereby incoming signals can be directly repeated into the opposite line by thereceiving relay Without the useof a transmitter." The relays may be'lof anysuitable type, provided,

the movable contact or armature of each is normally biased to a closed circuit position in order that thelines are normally closed through the repeater. Polarized relays are especially usefulin this connection, al-

though a light retractile spring maybe used to hold the armature in closed circuit position; or the base of the relay may be inclined, as in the case of, the Horton repeater. Polarized relays i may be connected differentially, as in duplex or quadruplex telegraphy,fbut it is preferable to connect eachzpairiof coils in aseparate circuit, as willbe hereina'ljter mpreruu eescribed. L In the accompanyingfjdrawing which illustrates certain embodiments of the invention, and wherein similar charactersjof reference indicate "corresponding partsiin both the use in the repeater.

Specification of Letters Patent Patented Sept, 22 1914 Application filed November '7, 1913 Serial No. 799,679."

views, Figure 1 is a diagrammatic view of a repeater of the polarized relay type; and Flg. 2 shows a modified form of relaylfor Referring to the drawing, A and A,

B and B, designate 'thetwo pairs of polarized relays which are embodied in the repeater, the relays A and A serving to repeat on lme 2 an incoming message re- 'ceived from line 1, and the relays B and B" serving to repeat on line -1 a mes: sage'received from-line 2. The relays A,

A and'B, B",consist respectively of circuit closing magnets M, M ,-M M, circuitopening magnets R, R R R movable contacts or armatures 5, 6, 7 and 8, fixed contacts or front stops 10, 11, 12fand 13, and back stops 10?, 11 12 and 13*. In order to hold the armatures in closed p0sition when the closing and opening magnets are deenergized each armature has connected thereto or associated therewith a permanent magnet 9. The cores a. of the electro-magnets are adjustable into properreation to their respective armatures-,-any

suitable means of adjustment being provided, such as the pinion b that meshes with rack teeth con the core extension (Z, 'so that by turning the pinion the core can'be moved toward or fromits armature.

The lines 1' and 2 are connected bywires e and 0, respectively with the contacts 7 and5 of the relays and The contacts 10 and 12 are respectively connected by Wires.

f and f" with one. terminal of the electromagnets M .and M. of such magnets are connected by wires. (7

and g" with the electro-magnets M M suchlateral magnets beingin turn connected by WiI'BS h and h with main batteries 20 and 20 thatare connected to ground. In other words, the magnets Mand M are connected in" serieswith each other and with line 1 and battery 20, and the magnets M and M are connected in series with each otherand with ,line 2 and battery. 20*. The

other magnets of therelays are'connected in local circuits. The magnets R and R are connected in series. by the wire 2', one'terminal ofthe magnet RT being connectedto ground at 7' through a local circuit battery lcfwhile the magnet R is connected by a The other terminals wire lto ground jatm throughthe contacts 8 and 13. The n'iagnetsIt andR ar'econ-- nectedin series with each other by a Wire 2',

the magnet R 'being connected to ground at 7" through a battery 75', and the magnet B being connectedby a wire Z to ground at .8 is arranged around the contacts 7 and 12 of the relay B, and a shunt S containing a switch .9 is arranged around the contacts and of the relay A.

Concerning the magnets of each polarized relay, itis to be observed that when no current is flowing in either of the opposed coils or electro-magnets, the armature between them will remain against either its front or back stop, provided the cores are equally distant from it. When the. core of therighthand magnet is closer to the armature the latter will remain against its front stop. If there is current flowing in both magnets in such a-direction as to give to the ends adjacent to the armature similar polarity, but. opposite to the polarity of the armature,

the'latter will be attractedtoward the core which exerts the strongest magnetic pull upon it, this pull varying directly as the;

ampere turns on the coil and approximately inversely to the square of the distance be-' tween the inner ends of the core and the armature.

In describing the operation of the repeater,

it will be assumed that the cores of the right electro-magnets are nearer their respective armatures than are the cores of the left electic-magnets, and that the current flowing through, or the magnetic flux produced by, the former is stronger than the current flow in. or magnetic flux of the latter, so that whencurrent is flowing through the various magnets the armatures will be in closed circuit position or in engagement with the front stops. Now, if an incoming signal is transmitted over the line 1 by the opening of a distant sending key thereiinthe magnet M- is deenergized, and consequently the ar-. mature 5 is attracted toopen circuit position by the magnet R, whichis in a closed circuit consisting of the battery 70, magnet R", wire z', magnet R wire Z contacts 8. and 13, groundm j.. The moving of the contact '5' to open 1 circuit-position opens the receiving line or inain2,so that the signal received over the line 1 will be directly trans mitted to, the receiving line 2. Simultaneously with the opening of line 2 by the arinature 5 the local circuit containing the magnets R and R will'be opened by the armature 6 moving out ofengagementwith the contact 11 through the deenergizing of the magnet M and attraction of themagnet R The magnets M and M are also deenergized when line 2 is opened by the movement of the armatureo of relay A to the left, but since magnets R and R are de energized simultaneously with M and M armatures 7 and 8 are held in their closed position by their permanent magnets, so that of relays A and A". When line 1 is again closed by the sending key at the distant stationthe magnets M andM 'of the relays A and A will be reenergized so as to restore the ar natures or contacts 5 and 6 to normal position, thereby again closing the receiving line or main 2 and the localcircuit containclosing of line 2 is repeated'inj true synchronism with the opening and closing of the sending line 1 in the transmission of dot, dash and space signals. Obviously'the repetitionvof signals from line2 to line '1 is effected in the same mannenexcept that the magnets M and willbe the ones that respond to theopening and closingof the line 2, and thearmatures"? and 8 will move. to open and closed position accordingly.

By means of sounders 0 jand'fQ, batteries p and p and keys K and K2 the repeater; attendant is enabled. to communicate with stations on either line. VVheneswitches-S and S are thrownto the; ground wires it and n, and switches 8? and s are thrown to closed circuit position,' th e repeater is cut and each line may be operated independently.

The modification shown in Fig. 2 isea single relay intended to. take the place of the double relays A and A or Band B. 'The magnets M andR? correspond respec tively to the magnetsM Uand M and R and R and the 'contactst? and '10 correand the contacts 6 andfll correspo'nd to the contacts 6 and 11;of relay A. It will be noted tl atthere is'a small space between the tipsof'icoiitac'ts 5? and 6 which pro vides for 6 and 11 opening before 5=Fand 10 line and local circuits may be provided to accomplish the results descr bed.

From-the foregoing description taken in.

the advantages of; the construction and method ofoperation will be, readily understood by those skilled. in'the art to which llllQilIlYQIliilOll appertains, and while I have described ffthe principle of operation, to-' gether withthe apparatus-which now consider to be the best embodiment thereof, I desire to haveitunderstood that the apparatus shown is"merelyflillustrative and that as are within the scope of the ap d d claims. v V.

neither line 1 nor the local circuit of mag- "nets R and R are opened by the opening r ing magnets R and R Thisopening and l spond to the contacts 5and lOof relay A, I

Obviously many other arrangements 0f armature and fixed contacts for the main connection with the accompanying drawing,

such clianges inay be made-when desired Having thus described: m invention, 1

' claim as new anddesire to secure by Letcomprising a relay for'each 'line, each relay having its coil in one'line wire anduitsicon-w.

tacts in the other line wire, and electromagnet means for opening the contacts when. the coil is deenergized.

2. The combination of line wires, with a repeater connected between the wires and comprising a relay for each line, ea chrelay including an electro-magnet in one line wire and contacts in the other line Wire, said contacts being held in closed circuit position by said magnets when energized, and magnets tending to open circuit the contacts whereby the opening and closing of one line wire causing the opening and closing of the other line wire. 7

3. The combination of line, wires over which signals are received and repeated, with a repeating apparatus comprising two sets of co-acting circuit closing and opening electro-magnets, normally closed line wire contacts associated with and operated by each set of said ymagnets, the circuit closing magnets of one set being in circuit with the line wire contacts of the other set, a local circuit for each of thecircuit opening magnets, and

normally closed local circuit contacts assooiated with and operated ,by each set of magnets, whereby the circuit opening magnets coacting with the circuit closing magnets connected with the receiving line will be deenergized with the opening of the receiving line,.and the circuit opening magnetsassociated with the circuit closing magnets connected with the sending line will remain energized to open the contacts of the receiving line. I

which signals are received and repeated, with a repeatingapparatus comprising polarized relays A, A and B B, each relay comprising opposed circuit-closing and opening electrQ magnets and normally closed circuit-opening and closing armatures movable to closed circuit positionby said closing magnets and to open circuit position by said opening magnets, said relays A and A having thelr circuit closing magnets connected with one line through the ar1nature of relay B, and the relays B and B having their circuit closing magnet-s connected'with the other line through the armature of relay A, and localcircuits including respectively the; opening magnets or" relays A and A and the armature of relay B, and

relays B and Band the armature of relay A; 5. The combination of line wires over which signals are received and repeated,

with a repeating apparatus comprising po- }larized relays A, A and 13,13, ach rela comprising opposed circuit-closing and opening '-electro-magnets and normajllyclosed circuit-opening and closing armatures =movable to 'closed circuit position by said clo's- 'ingmagn'e'ts'and to open circuit position by ,saidiopening magnets, said relays A and A havin their circuit closing magnets connect- ;edwit one linefihrough the armature of relay B, and the relays B and B having their circuit closing magnets connected with the other line through the armature of relay A, permanent magnets associated with said armatures for holding the latter in closed circuit position when the opening and closing magnets thereof are deenergized, and local cir cuits including a respectively the opening magnets of relays A and A and. the armature of relay B, and relays B and B and the armature of relay A;

6. The combination of a line wires over which signals are received and repeated, with a repeating apparatus comprising polarized relaysA, A, and B, B, each relay comprising opposed circuit closing and opening electro-matgnets and normally closed circuit opening and closing armatures movable to closed circuit position by said closing magnets and to open circuit position by said opening magnets, said relays A and A having their circuit closing magnets connected with one line through the armature of relay B, and the relays B and B having their circuit closing magnets connected with the other line through the armature of relay 1 A, local circuits including respectively the opening magnetsof relays A and A and the varmature of relay B, and relays B and'B and the armature of relay A, keys between the lines and armatures of relays A and B, and sounders in circuit with the armatures of relays A and B. 7 t

a a 7. The combination of line wires over 4. The combinatlon of hue wires over which signals are received and repeated, I

larizecl relays A, A, and B, B. each relay comprising opposed circuit closing and opening electro-magnets and normally closed circuit opening and closing armatures movable to closed circuit position by said closing-magnets and to open circuit position by said opening magnets, said relays A and A having their circuit closing magnets connected with one line through the armature of relay B, and'the relays B and B having their circuit closing magnets connected with the other-line through the armature of relay A, local circuits each having one side grounded and including respectively the opening magnets of relays A and A and the armature of relay B and opening magnets of relays B and B and the armature of relay A, keys between the lines and armatures of relays A and B, grounded circuits including sounders in series with the armatures of 0 5;-0pen'1ng magnets and the armature therein.

relays and B, switch containing shunts snamet -this'specification in thepresence'of in parallel relation with the armatures of two subscribing Witnesses.

Ife1ays-A= and B, a dn switch for grounding I RANKIN TEMPLE mmmg; v

'Witnesses: n

I GE RGE B. KIRKYATRICK, FRANCIS E. Lowm eachlocal circuit at a point between the Intestimony whereof I have signed my (Iopie's of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- I I Washington, I). G. 

